Bounded wildcard types arising during pattern t...

Bounded wildcard types arising during pattern type inference can cause
unnecessary crashes. Closes #1048, review by odersky.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/files/pos/bug1048.scala b/test/files/pos/bug1048.scala
new file mode 100644
index 0000000000..f88dbbc88b
--- /dev/null
+++ b/test/files/pos/bug1048.scala
@@ -0,0 +1,15 @@
+trait T[U] {
+  def x: T[V] forSome { type V <: U }
+}
+
+object T {
+  def unapply[U](t: T[U]): Option[T[V] forSome { type V <: U }] = Some(t.x)
+}
+
+object Test {
+  def f[W](t: T[W]) = t match {
+    case T(T(_)) => ()
+  }
+}
+
+